Parameter estimation

Social cost

The value of domestic labor to handle food waste: 10 USD/month [16]

· Conditions of calculation: Time it takes to put out food waste using elevators in apartments: 7.8 min/frequency, time it takes to put out food waste using FWDMs and elevators: 4 min/frequency, time it takes to discharge grinded food waste to the public sewage system using FWDs: 2 min/frequency.

· The labor value per ton of food waste when it is generally handled: 633 USD (= 10 USD/month ÷ 0.0158 ton/household/month).

· The labor value per ton of food waste when it is handled after using FWDMs: 325 USD (= 633 USD/ton ÷ 7.8 min/frequency × 4 min/frequency).

· The labor value per ton of food waste when it is handled after using FWDs: 162 USD (= 633 USD/ton ÷ 7.8 min/frequency × 2 min/frequency).

The value of domestic labor to handle food waste: 34 USD/month [13]

· The labor value per ton of food waste when it is generally handled: 2145 USD (= 33.895 USD/month ÷ 0.0158 ton/household/month).

· The labor value per ton of food waste when it is handled after using FWDMs: 1100 USD (= 2145/ton ÷ 7.8 min/frequency × 4 min/frequency).

· The labor value per ton of food waste when it is handled after using FWDs: 550 USD (= 2145/ton ÷ 7.8 min/frequency × 2 min/frequency).

Index to calculate GHG: Diesel 1 L = 7.07 × 10⁻⁴ ton CO₂ equiv., 1 kWh = 4.24 × 10⁻⁴ ton CO₂ equiv.